What Jack saw The Giant consuming on the dinner table in front of atlas? (5,4)

'table in front of atlas?' is the definition.
I know nothing about this answer so I can't tell whether it can be defined by this definition.

'what jack saw the giant consuming on the dinner' is the wordplay.
I cannot quite understand how this works, but
'giant' could be 'large' ('large' can be similar in meaning to 'giant') and 'large' is present in the answer.
'dinner' could be 'meal' (I've seen this in other clues) and 'meal' is found in the answer.
This accounts for all the letters.
This may be the basis of clue (or it may be nonsense).

Can you help me to learn more?